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 HCA and ideal scope
P:  3/1/2002 11:55:15 AM  
cinder
cinder

Rough Rock
Total Posts: 9
Last Post: 3/11/2002
Member Since: 1/6/2002
 
 		First of all,I just received my ideal scope, what a really neat tool it is. The best, not to mention a really fun $20.00 tool. All my friends are "viewing". I was playing around with the HCA today, and found something that really surprised me, if all dimensions are the same and I change my pavillion angle from 41.1 to 41.2, just that small 1/10 will change the performance from 1.7 excellent within TIC to 2.1 very good. Is that .1 percentage more or less important (visually) with larger stones? I hope this is an understandable question. I love the HCA and again the ideal scope is just what it says it is. Also a good coctail party toy! Thanks all
Posted:  3/1/2002 11:55:15 AM

 There are 2 replies to this message.  There are 2 replies on this page.
P: 3/1/2002 1:38:41 PM
Pricescope
Pricescope

Administrator
Total Posts: 8,265
Last Post: 1/5/2008
Member Since: 1/1/2000
 
 		Hi Cinder,

Glad you found ideal-scope useful.

You are right, when pavilion angle becomes > 41°, HCA grade gets worse sharply because light leakage under the table becomes very strong (see DiamCalc simulations for 34.5° crown angle below).

For more details see the chart here: Defining the Beauty and Desirability of Round Brilliant Diamonds: Summary



Pricescope
Posted:  3/1/2002 1:38:41 PM
P: 3/1/2002 3:54:26 PM
oldminer
oldminer

Ideal Rock
Total Posts: 4,964
Last Post: 11/20/2009
Member Since: 9/4/2000
 
 		You will find that very tiny differences mean a great deal. The overly liberal approach to what makes an "ideal cut" diamond helps to sell stones, but does not serve to accuratly describe them. The Ideal-Scope is a powerful, inexpensive and objective little device that combined with good vision makes you know a whole lot about a diamond's cut quality.

A picture is worth a thousand words.... It holds true for the Ideal-Scope.

David S. Atlas

GG(GIA), ASG, Sr. Mbr. NAJA

www.datlas.com
Posted:  3/1/2002 3:54:26 PM

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